This Civil War record is most likely for this William as there was/isn o Oakland Co, IL:
Name: William Collins ,
Residence: Oakland County, Illinois
Enlistment Date: 09 August 1862
Distinguished Service: DISTINGUISHED SERVICE
Side Served: Union
State Served: Illinois
Unit Numbers: 402 402
Service Record: Enlisted as a Musician on 09 August 1862
Enlisted in Company K, 79th Infantry Regiment Illinois on 28 August186 2.
Mustered out Company K, 79th Infantry Regiment Illinois on 12 June1865 i n Camp Butler, Springfield, IL
IN where the first two children were born. Apparently the couplemoved t here shortly after their marriage.
IL Bef 1879 They moved back before the birth of daughter Flossie.
6/19/1880 E Oakland Twp, Coles Co, IL. The census taker foundWilliam a t age 38, a farmer, wife Amanda was 24, with one small son,Charles, 1. L ouis Benedick, 48, farm hand, was also counted there.
6/15/1900 Same place. That year at census time William was 57, hadbe en married 23 years to Amanda J, 45, with 5 children but only 3still s urvived. In the house were Charles C, 21, William H, 13, andFlossie B , 11. William and both parents were born in OH.
4/28/1910 Still there. William listed in the census at 67, Mandy Jat 5 5, and married 34 years. Three of their five children were stillalive . William was still farming.